The new Specialized S-Works Turbo Levo 4 just earned WIRED's seal of approval as the ultimate electric mountain bike, with one caveat - it's so engaging that riders literally lose track of time on the trails. The $13,000 flagship model combines intuitive torque sensors with controversial Class I/III speed switching that's raising eyebrows in the mountain biking community.
The electric mountain bike wars just got a new champion. Specialized's S-Works Turbo Levo 4 has earned WIRED's coveted review crown, but not without stirring up some controversy along the way.
Stephanie Pearson's exhaustive field test at Duluth's Spirit Mountain bike park revealed what might be the most intuitive e-MTB ever built. After 50-plus miles of testing across everything from flowy berms to technical rock bridges, the verdict is clear - this machine transforms intermediate riders into trail legends, at least in their own minds.
The real magic happens in the bike's torque sensors. Unlike previous generations that felt clunky or disconnected, the Levo 4's high-performance sensors instantly read rider input and amplify it seamlessly. "The bike can instantly feel the rider's output and amplify it while maintaining control, traction, and precision at higher speeds," Pearson notes in her WIRED review.
That intuitive feel shows up most in Auto mode, the sweet spot among the bike's four power settings (Eco, Auto, Trail, and Turbo). During her Spirit Mountain session, Pearson climbed 3,451 feet over 22 miles in about two hours while still maintaining 44% battery life - numbers that would have been unthinkable just a few years ago.
But Specialized packed in one feature that's raising eyebrows across the mountain biking community. The Levo 4 can toggle between Class I (20 mph limit) and Class III (28 mph limit) e-bike classifications through its Master Mind computer system. While designed for riders who commute on city streets before hitting trails, the feature creates what Pearson calls "a Pandora's box."
The ethical dilemma is real. Most US trails restrict e-bikes to Class I speeds, but once riders experience the higher-speed thrills, who's going to voluntarily dial it back down? "Specialized puts the onus on the rider to follow the rules," the review notes, especially concerning given safety issues on trails shared with traditional mountain bikers.
The controversy extends beyond just speed limits. As electric mountain bikes gain mainstream acceptance, incidents like Pearson's rock bridge bail-out highlight how the technology can outpace rider skill. The surge of power when she hesitated mid-obstacle sent her diving into the bushes - a reminder that these machines are only as competent as their operators.
